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| Number | Title | Issue Date |
| 7268100 | Shale inhibition additive for oil/gas down hole fluids and methods for making and using same An under-balanced drilling fluid additive is disclosed which reduces reactive shale and/or clay swelling during under-balanced drilling operations, where the additive includes an effective amount of a choline salt. A method for under-balanced drilling is also disclo... | 09/11/2007 |
| 6901835 | Cone and charge extractor An extractor and method for safely releasing an explosive and liner from a munition is disclosed. An exemplary extractor includes a support device connected to the casing of the munition and adapted to stabilize the munition as the explosive is released from the dom... | 06/07/2005 |
| 6761416 | Method and apparatus for a plasma-hydraulic continuous excavation system A plasma-hydraulic excavation system suitable for use in connection with mining operations is provided. According to the system, one or more groups of plasma-hydraulic projectors that include a reflector and a pair of electrodes are used to break an area of rock. Th... | 07/13/2004 |
| 6688702 | Borehole mining method A Borehole Mining method comprising driving a borehole, into a production zone under a low-degree angle (0 | 02/10/2004 |
| 6375271 | Controlled foam injection method and means for fragmentation of hard compact rock and concrete Breaking hard compact materials, such as rock and concrete, is based upon a controlled-fracturing process. A high-pressure foam is used to pressurize a predrilled hole of appropriate geometry. The high-pressure foam is delivered to the bottom of the drill... | 04/23/2002 |
| 6215734 | Electrohydraulic pressure wave projectors A projector (10) for creating electrohydraulic acoustic and pressure waves comprising an energy source (21) (such as a capacitor) within approximately one meter of an electrode array (23). Larger projectors may be formed by arraying the projectors, and st... | 04/10/2001 |
| 6145934 | Discharge destroying method, discharge destroying device and method of manufacturing the same A method comprising a step to form a hole (2) for charging a breaking substance (4) into an object to be fractured (1), a step to insert a pair of electrodes (6) having a thin metal wire (5) connected between ends thereof into the hole (2), a step to disp... | 11/14/2000 |
| 6145933 | Method for removing hard rock and concrete by the combination use of impact hammers and small charge blasting The present invention is directed to a method for breaking rock and other hard materials using small-charged blasting techniques followed by a mechanical impact breaker. In small-charge blasting techniques, a gas is released into the bottom of a sealed ho... | 11/14/2000 |
| 6123394 | Hydraulic fracturing of ore bodies A method of mining that makes use of hydraulic fracturing. The method comprises fracturing an ore body hydraulically by introducing fluid rapidly into a bore or fissure in the ore body such that pressure in the bore or fissure builds up rapidly and it fra... | 09/26/2000 |
| 6102484 | Controlled foam injection method and means for fragmentation of hard compact rock and concrete Breaking hard compact materials, such as rock and concrete, is based upon a controlled-fracturing process wherein a high-pressure foam is used to pressurize a pre-drilled hole of appropriate geometry. The high-pressure foam is delivered to the bottom of t... | 08/15/2000 |
| 5853224 | Method for completing a well in a coal formation A method for completing a well penetrating a solid carbonaceous subterranean formation by positioning a perforating gun in an uncased portion of a wellbore penetrating the solid carbonaceous subterranean formation; perforating the coal formation; and, pro... | 12/29/1998 |
| 5803551 | Method apparatus and cartridge for non-explosive rock fragmentation A non-explosive rock breaking method is disclosed. The method is accomplished by first drilling a hole into a rock. A charging system is then positioned adjacent the hole and a propellant cartridge is inserted within the charging system. The propellant ca... | 09/08/1998 |
| 5611605 | Method apparatus and cartridge for non-explosive rock fragmentation A non-explosive rock breaking method. The method is accomplished by first drilling a hole into a rock. A charging system is then positioned adjacent the hole and a propellant cartridge is inserted within the charging hosing. The propellant cartridge conta... | 03/18/1997 |
| 5494108 | Method for stimulating a coal seam to enhance the recovery of methane from the coal seam A method is disclosed for increasing the methane recovery rate through a wellbore which penetrates a coal seam. The invention utilizes the cavitation of the coal seam surrounding the wellbore after a substantial percentage of the original methane-in-place... | 02/27/1996 |
| 5474364 | Shotgun cartridge rock breaker A rock breaker uses shotgun cartridges or other firearm ammunition as the explosive charge at the bottom of a drilled borehole. The breaker includes a heavy steel rod or bar, a gun with a firing chamber for the ammunition which screws onto the rod, a long... | 12/12/1995 |
| 5474129 | Cavity induced stimulation of coal degasification wells using foam An improved method for stimulating coal degasification wells comprising the injection of a foam into a coal seam which contains natural or induced fractures. Thereafter, high pressure gas is injected into the coal seam and suddenly released to cause disin... | 12/12/1995 |
| 5464061 | Cryogenic coal bed gas well stimulation method Methane gas recovery from wells extending into subterranean coal seams is stimulated by treatment of near-wellbore coal seam with cryogenic liquid.... | 11/07/1995 |
| 5419396 | Method for stimulating a coal seam to enhance the recovery of methane from the coal seam A method is disclosed for increasing the methane recovery rate through a wellbore which penetrates a coal seam. The invention utilizes the cavitation of the coal seam surrounding the wellbore after a substantial percentage of the original methane-in-place... | 05/30/1995 |
| 5399056 | Method for controlling a final pile diameter in a cast-in-place of solidification pile An apparatus for forming a pile produces a predetermined pile diameter in a cast-in-place pile. The apparatus includes an agitating arrangement which includes a pipe extending longitudinally into the ground, a plurality of agitating blades supported by th... | 03/21/1995 |
| 5380127 | Non-entry method of underground excavation in weak or water bearing grounds A method of excavating an underground area liable to flooding or collapsing during excavation, wherein the area is susceptible to disaggregation by high pressure water jet and is located above rock of strength suitable for drifting a gallery comprises dri... | 01/10/1995 |
| 5308149 | Non-explosive drill hole pressurization method and apparatus for controlled fragmentation of hard compact rock and concrete Rock and other hard materials, such as concrete, are broken by a controlled-fracturing process referred to as penetrating-cone fracture. The fracturing process is accomplished by pressurizing the bottom of a drill hole in such a way as to initiate and pro... | 05/03/1994 |
| 5253926 | Process for making general use of the earth's heat and obtaining minerals in the zone of weakness (at depths of 13-30 km) The hot-weak-rock process for overcoming the technical limitation inherent to the Hot-Dry-Rock Process, of not being able to overcome the shear strength of the rock beyond a certain depth in order to create heating surfaces through HYDRAFRAC. The hot-weak... | 10/19/1993 |
| 5199766 | Cavity induced stimulation of coal degasification wells using solvents An improved method for stimulating coal degasification wells comprising the use of a coal comminuting solvent to weaken the cleat structure of a coal seam immediately prior to use of high pressure gas in a gas cavitation process. A solvent such as ammonia... | 04/06/1993 |
| 5147111 | Cavity induced stimulation method of coal degasification wells A cavity induced stimulation method for improving the initial production of fluids, e.g. methane, from a coal seam. A well is drilled and completed into the seam. A tubing string is run into the hole and liquid CO2 is pumped down tubing while a... | 09/15/1992 |
| 5116104 | Method and equipment for loosening and/or winning minerals especially coal and aggregated materials by using compressed air breaking A method for breaking coal and other mineral matter from a bed thereof provided with a bore hole consists of the steps of applying a flushing medium to a drill bit, loosening the mineral matter upon completing the drilling by conveying the compressed air ... | 05/26/1992 |
| 5098163 | Controlled fracture method and apparatus for breaking hard compact rock and concrete materials Hard compact materials, such as rock, concrete, et cetera, are broken by igniting an appropriately designed explosive or propellant charge placed within the hole or carried in a special charge-containing device with a short barrel which is inserted and se... | 03/24/1992 |
| 5000516 | Apparatus for rapidly generating pressure pulses for demolition of rock having reduced pressure head loss and component wear An inlet chamber receives fluid from a small high pressure pump, such fluid flowing through a flow restrictor and one-way valve into an accumulator, until very high pressure is established in the accumulator. At the same time, a sealed poppet is pushed ag... | 03/19/1991 |
| 4863220 | Highly reliable method of rapidly generating pressure pulses for demolition of rock Providing a fluid pressure pulse generator having a fluid inlet chamber communicating with an accumulator via a movable ball positioned within the inlet chamber, a narrow fluid passageway bypassing the ball, an outlet chamber coupled to a valve seat for p... | 09/05/1989 |
| 4761039 | Cutting head for removing material with a high velocity jet of working liquid A liquid cutting head for removing material with a high velocity jet of working liquid supplied by an ultra-high pressure pump includes a nozzle having an outlet for forming and directing a thin high velocity stream of liquid to impact against a workpiece... | 08/02/1988 |
| 4669783 | Process and apparatus for fragmenting rock and like material using explosion-free high pressure shock waves A technique for fragmenting rock or other relatively hard and/or compact material without the use of explosives is disclosed herein. In accordance with this technique, an elongated, blind opening is provided in the rock or other material to be fragmented ... | 06/02/1987 |
| 4666212 | Metal value recovery Metal values, particularly precious metal values, are recovered from fines on a footwall and in the fissures and cracks therein by passing a solution capable of solubilizing the metal values across the footwall. The metal values are preferably adsorbed on... | 05/19/1987 |
| 4626031 | Apparatus for loosening and/or breaking coal deposits, rocks, granular or lumpy material, or scrap An apparatus for breaking coal or other mineral matter from a bed thereof which comprises a string filling a bore hole which can rise steeply in this bed. The string consists of alternating breaking units and connecting pipes each braking unit having a di... | 12/02/1986 |
| 4586213 | Machine for preparing a concrete surface for coating This invention is concerned with a machine for automatically removing a curing film or membrane from a concrete floor surface and etching that surface in preparation for applying a surface coating and doing this in less time than has heretofore been requi... | 05/06/1986 |
| 4569558 | Drag bit construction A mounting movable with respect to an adjacent hard face has a projecting drag bit adapted to engage the hard face. The drag bit is disposed for movement relative to the mounting by encounter of the drag bit with the hard face. That relative movement regu... | 02/11/1986 |
| 4479541 | Method and apparatus for recovery of oil, gas and mineral deposits by panel opening A method for oil, gas and mineral recovery by panel opening drilling including providing spaced injection and recovery drill holes (10, 12) which respectively straddle a deposit bearing underground region (20), each drill hole including a panel shaped ope... | 10/30/1984 |
| 4474409 | Method of enhancing the removal of methane gas and associated fluids from mine boreholes The method disclosed herein relates to the removal of unwanted gases and associated fluids in underground mining operations by utilizing mine boreholes. After the mine borehole has been drilled its desired distance from the mine face, an inflatable packer... | 10/02/1984 |
| 4471840 | Method of coal degasification A method for producing methane gas and other gases present from a subterranean coal-containing formation comprising the creation of a fracture in the subterranean coal-containing formation, introduction of a propping agent into the open fracture after whi... | 09/18/1984 |
| 4449754 | Device for breaking monolithic structures by pulsewise liquid pressure A device for breaking monolithic structures or pulsating by inducing pressure in a liquid filling a pre-drilled hole in the monolithic structure to be shattered comprises a tubular housing having a cavity for accommodating an explosive charge. Provided in... | 05/22/1984 |
| 4394051 | Method of hydrospalling A method of breaking rock from a free surface which uses hydrofracturing to induce rock failure. Initially, a hole is cut in the rock face to a depth suitable for spalling by a high pressure water jet drill. Next, at the bottom of this hole a thin circula... | 07/19/1983 |
| 4370077 | Method of pressurizing and stabilizing rock by periodic and repeated injections of a settable fluid of finite gel strength A finite region of overpressure can be created in solid underground formations by the periodic injection of a fluid that has finite gel strength that subsequently, after each injection, partially sets--i.e., equivalently becomes a very much stronger gel. ... | 01/25/1983 |
